Rear curb side slide out won't extend.

[Letsgoagain]

Hello,
The rear small curb side slide out won't extend. When I push the button the forward side tries to move but the aft side doesn't move.
My first thought was to look for anything caught underneath the slide on the bedroom floor or around the perimeter. Nothing is obstructing the slide from moving.
I started thinking electrical and it appears there are two motors to drive the slide. The aft one is not activating. My manual says look for a fuse or auto reset circuit breaker adjacent to the inverter which is in the curbside aft storage bay. I looked and didn't see any circuit breaker in that area. I did find a slide out synchronization control box there and a wiring loom next to that with a fuse in it that I checked and it appears okay.
There are two sets of wires coming out of that box, one for the left side and right side of the slide out. I switched them to see if I could get the aft side to drive but the slide still only moved on the forward side just a little as before.
Does anyone know where I can go from here trouble shooting. Need some other thoughts on this.
I did see another thread that said there is a control module in the aft right cabinet area but if its there I need the slide in the out position to get at it.
Any help appreciated.
Thanks, Keith

[windsorbill]

Start with the easy stuff first. Are your batteries fully charged?